The gusher phenomenon is a very rare complication that may occur during stapedectomy or cochleostomy. A sudden perilymphatic flow of cerebrospinal fluid can be seen following platinotomy. The cause is an abnormal connection between subarachnoid and perilymphatic spaces due to congenital malformation, leading to an abnormally wide cochlear aqueduct or due to an internal auditory canal fistula. We describe a case of posttraumatic gusher phenomenon after a fracture of the petrous bone.